2007 FIAT MULTIPLA ignition

INTRODUCTION ....................................................................................... 3
FUNCTIONAL DIAGRAM OF THE SYSTEM....................................... 6
BOTTLES ....................................................................................................... 7
SOLENOID VALVE/SAFETY DEVICES ................................................... 8
PIPES ............................................................................................................... 9
PRESSURE REDUCER/REGULATOR ...................................................... 9
NATURAL GAS INJECTORS .................................................................... 9
NATURAL GAS ELECTRONIC CONTROL UNIT ............................ 9
NATURAL GAS/PETROL SWITCH ........................................................ 10
NATURAL GAS AMOUNT INDICATOR.............................................. 11
FUEL CUT-OFF SWITCH ......................................................................... 12
ENGINE STARTING ................................................................................... 12
TO THE FILLING STATION .................................................................... 13
IF A TYRE IS PUNCTURED....................................................................... 14
BOTTLE IDENTIFICATION DATA ........................................................ 15
BOTTLE INSPECTION .............................................................................. 15
SERVICE SCHEDULE................................................................................... 16
BODYWORK VERSION CODES ............................................................ 17
ENGINE ......................................................................................................... 17
FUEL FEED/IGNITION ............................................................................... 18
IGNITION ..................................................................................................... 18
COOLING SYSTEM .................................................................................... 18
PERFORMANCE........................................................................................... 18
WEIGHTS....................................................................................................... 19
DIMENSIONS ............................................................................................... 20
FUELLING AND FILLING ......................................................................... 21
FUEL CONSUMPTION .............................................................................. 22
CO
2 EMISSIONS.......................................................................................... 23
FUSES .............................................................................................................. 23
This enclosure deals with the Fiat
Multipla petrol-natural gas version.
Refer to the Fiat Multipla Owner
Handbook for any subject not covered
by this supplement.
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9
PIPES
The natural gas pipes are made of galvanized iron and coated with plastic
material.
PRESSURE REDUCER/REGULATOR
The pressure reducer is installed in the engine compartment.
Its function is to reduce the natural gas pressure from the value found in
the bottle to the natural gas injector feed value (approximately 9 bar) and
keep the same constant under any operating condition.
NATURAL GAS INJECTORS
Four special natural gas injectors directly fitted into the cylinder head,
one for each intake manifold; they are fed at a steady pressure
(approximately 9 bar) and operated by the special electronic control unit.
ELECTRONIC CONTROL UNIT FOR NATURAL GAS
SYSTEM
Special electronic control unit for ignition advance and natural gas feed
control.
In the event that the natural gas runs out, the control unit will
automatically manage the shift to the petrol feed mode.
The control unit is located under the dashboard, on the passenger’s side.
F0E0574m
F0E0575m
F0E0576m
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18
FUEL FEED (Natural gas)
Electronic injection specific to the natural gas.
Type: Sequential, timed Multipoint injection.
Injection pressure: approximately 9 bar.
Stoichiometric metering of the air/natural gas mixture.
The natural gas injection system is controlled by a
special control unit by making use of the sensors
previously fitted to the vehicle, including the oxygen
sensor for fuel metering control.
IGNITION
Electronics with static advance integrated with
injection.ENGINE COOLING
Engine cooling system with branching-off to bring hot
fluid in contact with the pressure reducer (which is
subject, during its operation, to heavy cooling).
PERFORMANCE
Maximum speeds in the 5
thgear (kph):
petrol fuelling: 168
natural gas fuelling: 157
Any modification or repair made to the fuel feed system in a wrong way and
without considering the technical features of the system may cause operating
anomalies with a risk of fire.WARNING
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